Brush-holder for dynamo-electric machines



(No Modl.)

S. H. SHORT. BRUSH HOLDER FOR DYNAMO ELECTRIC MACHINES. No. 462,883. Patented Nov. 10,1891.

FIELL UNITED STATES PATENT OFFICE.

SIDNEY II. SHORT, OF CLEVELAND, OllIO.

BRUSH-HOLDER FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 462,883, dated November 10, 1891.

' Application filed July 6, 1891. Serial No. 398,570. (No model.)

To all whom/ it may concern;

Be it known that I, SIDNEY I-l. SHORT, of Cleveland, in the county of Ouyahoga and State of Ohio, have invented certain new and useful Improvements in Brush-Holders for Dynamo Electric Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which. it appertains to make and use the same.

This invention relates more particularly to the holders for carbon rods or plates adapted to rest upon the commutators of dynamo-electric machines and serve as the brushes to establish connection of the external circuit with the armature.

In accordance with the present invention solid bearings are provided on opposite sides of the rod or plate not directly opposite each other, but at different distances from the commutator. They are so arranged that the rotation of the commutator tends to press the rod or plate against the more advanced bearing, or, in other words, against the bearing nearest the commutator. These bearings hold the rod or plate solidly against the rotation of the commutator. To establish a good, reliable electrical contact between the rod or plate and the bearings, springs are arranged to press the rod or plate against the said bearings. These springs also prevent chattering. To feed the rod or plate, a hinged springpressed follower is employed, having on the face a spring which adapts it to press evenly against the end of the rod or plate in all positions of the hinged follower.

In the accompanying drawings, which form part of this specification, Figure I is a view illustrating in section brush-holders in accordance with the invention applied to a commutator. Figs. II, III, and IV are views ona larger scale of one of the brushes detached, Fig. II being a cross-section, Fig. III a plan, partly in horizontal section, and Fig. IV an elevation with the follower omitted from the holder for the right-hand rod or plate.

A is the commutator, of ordinary construction, and B a bracket for the brush-holders C and D. These holders are insulated at E from the bracket B and are each adapted to hold three rods or plates. The holder-frame has a top 2, bottom 3, ends l, and (in case two or more rods or plates are to be held) one or more partitions 5. Inside the frame are the bearings 6 and G (in one piece of metal with the frame 2 3 at 5.) They are on opposite sides of the brush rod or plate F, but are not directly opposite, the bearings 6, toward which the rotation of the commutator (indicated by the arrow in Fig. 1) tends to move the rod or plate F, being the nearer to the commutator. As shown, moreover, the upper bearings are not in line with the lower bearings, and each bearing-surface is less than the full width of the bar or plate. This construction takes less material than having surfaces all the'way across and facilitating the introduction of springs; but full width hearings or other convenient arrangement of bearing-surfaces could be used, and such use would be within the invention. Springs 7, interposed between the top 2 and bottom 23 of the holder-frame and the brush rod or plate F, tend to hold the same against the bearings (3 and (3 with sufficient force to constitute at all times a reliable electrical contact. The rods or plates F are each fed against the commutator by the follower S, which is hinged at 9 to a bracket on the holder-frame and is pressed forward by the springs 10, (shown as spiral tensionsprings.) Each of these followers is faced with a springll in the form of abowed spring fastened to the follower by rivets 12 or other known or suitable means. As the rod or plate wears off at the end it is advanced by the springs 10, acting on the follower 8, and the bowed spring 11 adjusts itself to the varying position of the follower 8, so as to maintain always a proper pressure on the rod or plate.

At G is a binding-post or means for attaching the exterior circuit to the brush-holder.

When it is desired to remove a rod or plate, the follower S is drawn back by the ring 8' until the projection 8 catches against the pin 13, in which position it is held by the springs 10, now acting on the other side of the hinge f). The rod or plate can now be slid out and can be replaced.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A brush-holder provided with bearings on opposite sides of the brush rod or plate, one in advance of the other, and springs pressing the rod or plate against said bearings, substantially as described.

2. In combination with a commutator, a brush-holder with bearings on opposite sides of the brush rod or plate, the bearing toward which the rod or plate is pressed by the commutator being in advance of the other and also provided with springs pressing the rod or plate against said bearings, substantially as described.

In combination with a commutator, a brush-holder having a spring-pressed follower and a flat spring secured to the face of the follower, the free ends of the spring being hent inwardly to form independent springbearings at the opposite edges of the follower, substantially as set forth.

at. The holder-frame with its bearings and springs, in combination with a spring-pressed follower, substantially as described.

5. A brush-holder having bearings for the rod or plate on opposite sides of the said rod or plate in advance one of the other and out of line, substantially as described.

In testimony whereof I have signed this specification in the presence 01": two subscribing witnesses.

SIDNEY ll. SHORT.

\Vitnesses:

.TAs. A. HUGHES, J. (J. BELL. 

